论文部分内容阅读
首先根据实际泡沫材料中存在不少弯曲支柱,且形状接近于弧线,在假设全部支柱为弯曲支柱的情况下,利用理论方法分析了支柱弯曲对开孔泡沫材料刚度和强度性能的影响规律,得到了理论预测含弯曲支柱开孔泡沫材料杨氏模量和屈服强度的公式。然后,通过有限元模拟方法验证了上述理论预测模型的有效性。最后,利用有限元模型研究了不同比例的弯曲支柱、不同弧度的弯曲支柱和不同各向异性比对泡沫铝压缩力学行为的影响。结果表明,弯曲支柱对弹性模量的影响比对塑性坍塌强度的影响大;而弯曲支柱对泡沫铝压缩力学行为的影响则与支柱的弧度、支柱含量和胞体结构的各向异性比有关。
Firstly, according to the fact that there are many curved pillars in the actual foam material and the shape is close to the arc, the influence law of the bending of pillars on the stiffness and strength properties of open-cell foam materials is analyzed theoretically under the assumption that all the pillars are curved pillars. The formula for predicting the Young’s modulus and yield strength of the open-celled foam with curved columns was obtained. Then, the validity of the above theoretical prediction model is verified by finite element simulation. Finally, the effects of different proportions of curved columns, curved columns with different radian, and different anisotropy ratios on the compressive behavior of aluminum foams were investigated by means of finite element analysis. The results show that the influence of flexural brace on the elastic modulus is greater than that on the plastic collapse strength. The effect of flexural brace on the compressive mechanical behavior of aluminum foam is related to the radian, pillar content and the anisotropy ratio of the cellular structure.